Ans 2) 12
2 males who are grandfathers
4 males who are fathers (2 grandfather also father)
So, only father but not grandfather =2 male
Similarly,
2 females who are grandmothers
4 females who are mothers (2 grand mother are also mother)
So, only mother but not grandmother =2 female
3 gathering possible here
1> (1 grand father, 2 gandson,1son, 1 daughter or daughter in law)
2> (1 grand mother, 2 grand daughter,1 daughter , 1 son or son in law)
3> (1 grand father , 1 grand mother)
Sum up all the gathering of 1> , 2> , 3> . It will be 12